<template>
  <div class="star" :class="starType">
    <span v-for="(itemClass, index) in itemClasses" :key="index" :class="itemClass" class="star-item"></span>
  </div>
</template>

<script type="text/ecmascript-6">
const LENGTH = 5;
const CLS_ON = 'on';
const CLS_HALF = 'half';
const CLS_OFF = 'off';

export default {
  props: {
    size: {
      type: Number
    },
    score: {
      type: Number
    }
  },
  computed: {
    starType () {
      return 'star-' + this.size;
    },
    itemClasses () {
      let result = [];
      let score = Math.floor(this.score * 2) / 2;
      let hasDecimal = score % 1 !== 0;
      let integer = Math.floor(score);
      for (let i = 0; i < integer; i++) {
        result.push(CLS_ON);
      }
      if (hasDecimal) {
        result.push(CLS_HALF);
      }
      while (result.length < LENGTH) {
        result.push(CLS_OFF);
      }
      return result;
    }
  }
};
</script>

<style scoped lang="stylus" rel="stylesheet/stylus">
@import "../../common/stylus/mixin.styl";

.star {
  font-size 0
  .star-item {
    display inline-block
    background-repeat no-repeat
  }
  &.star-48 {
    .star-item {
      width 20px
      height 20px
      margin-right 22px
      background-size 20px 20px
      &:last-child {
        margin-right 0
      }
      &.on {
        bg-image('star48_on')
      }
      &.half {
        bg-image('star48_half')
      }
      &.off {
        bg-image('star48_off')
      }
    }
  }

  &.star-36 {
    .star-item {
      width 15px
      height 15px
      margin-right 6px
      background-size 15px 15px
      &:last-child {
        margin-right 0
      }
      &.on {
        bg-image('star36_on')
      }
      &.half {
        bg-image('star36_half')
      }
      &.off {
        bg-image('star36_off')
      }
    }
  }

  &.star-24 {
    .star-item {
      width 10px
      height 10px
      margin-right 3px
      background-size 10px 10px
      &:last-child {
        margin-right 0
      }
      &.on {
        bg-image('star24_on')
      }
      &.half {
        bg-image('star24_half')
      }
      &.off {
        bg-image('star24_off')
      }
    }
  }
}
</style>
